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fuse: verify write return

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commit 8aab336b14c115c6bf1d4baeb9247e41ed9ce6de upstream.

Make sure filesystem is not returning a bogus number of bytes written.

Fixes: ea9b9907b82a ("fuse: implement perform_write")
Cc: <stable@vger.kernel.org> # v2.6.26
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Miklos Szeredi 2019-11-12 11:49:04 +01:00 committed by Greg Kroah-Hartman
parent ba916a1310
commit 8aa5c23ef8
1 changed files with 2 additions and 0 deletions
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fs/fuse/file.c
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@ -1098,6 +1098,8 @@ static ssize_t fuse_send_write_pages(struct fuse_io_args *ia,
ia->write.in.flags = fuse_write_flags(iocb);
err = fuse_simple_request(fc, &ap->args);
if (!err && ia->write.out.size > count)
err = -EIO;
offset = ap->descs[0].offset;
count = ia->write.out.size;